Simultaneous Removal Of Ammonium And Phosphate Using Magnesium Chloride Modified Zeolite
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Date
2021-08-01
Authors
Gunasegran, Vikneshan
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
This study analyzed individual and simultaneous sorption of ammonium
(NH4+) and phosphate (PO43-) and their mechanisms together with their major
operating parameters such as initial nutrient concentration, types of zeolites, and
addition of salt onto Mg2+- modified zeolites. The phosphate reported a removal
efficiency of -62.68% due to poor sorption for individual sorption, and 13.49% for
simultaneous removal. Besides, the removal efficiency of ammonium in individual and
simultaneous sorption is 59.98% and 35.87%, respectively. The ammonium and
phosphate removal efficiency decreases as the initial nutrient concentration increases.
Moreover, the mordenite typed zeolites showed much better adsorption for both
individual and simultaneous with a higher removal efficiency of 59.98% and 35.87%,
respectively for ammonium at an initial concentration of 20 ppm. However, the zeolite-Y
had more adsorption capacity towards phosphate with a higher removal efficiency
of 19.91%. The individual presence of Na+ had a significantly negative effect on the
removal of ammonium as Na+ possesses small ionic radii than NH4+, which reduces
ammonium uptakes. The pseudo-second-order model could describe the adsorption of
nutrients with higher (R2 ≥ 0.99), where chemical actions mainly govern the process.
The Langmuir model can be acceptably applied to fit the experimental data with a
higher correlation coefficient (R2 = 0.995) for individual ammonium sorption,
suggesting that the adsorption is a monolayer coverage. The addition of MgCl2 to the
reaction system promoting the desorption process for both separate and simultaneous
processes revealed the possibility of regeneration and reusability of the adsorbent.